WO2013092652A1 - Dispositif de dosage d'alimentation en continu - Google Patents

Dispositif de dosage d'alimentation en continu Download PDF

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Publication number
WO2013092652A1
WO2013092652A1 PCT/EP2012/076067 EP2012076067W WO2013092652A1 WO 2013092652 A1 WO2013092652 A1 WO 2013092652A1 EP 2012076067 W EP2012076067 W EP 2012076067W WO 2013092652 A1 WO2013092652 A1 WO 2013092652A1
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WO
WIPO (PCT)
Prior art keywords
rotor
rotors
particulated material
chambers
stator
Prior art date
Application number
PCT/EP2012/076067
Other languages
English (en)
Inventor
Yahya Bouquoyoue
Alvaro Fernandez
Original Assignee
Total Research & Technology Feluy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Total Research & Technology Feluy filed Critical Total Research & Technology Feluy
Priority to EA201490923A priority Critical patent/EA029241B1/ru
Priority to CN201280063300.3A priority patent/CN103998120B/zh
Priority to EP12813815.3A priority patent/EP2794082B1/fr
Priority to KR1020147019481A priority patent/KR101619053B1/ko
Publication of WO2013092652A1 publication Critical patent/WO2013092652A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B01J8/002—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor with a moving instrument
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B01J8/003—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor in a downward flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B01J8/0045—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor by means of a rotary device in the flow channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00743—Feeding or discharging of solids
    • B01J2208/00752—Feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00743—Feeding or discharging of solids
    • B01J2208/00761—Discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00743—Feeding or discharging of solids
    • B01J2208/00769—Details of feeding or discharging
    • B01J2208/00787—Bringing the solid in the form of a slurry before feeding it to the reactor

Definitions

  • the present invention relates to a delivery system for dispensing continuously a controlled amount of dry or slurried particulated material.
  • the present invention especially relates to a catalyst delivery means for introducing a catalyst into a polymerization reactor.
  • a metering system is employed for dispensing particulated material, that utilizes a feeder, such as a quantitative powder feeder, based on a rotary system.
  • a feeder such as a quantitative powder feeder
  • Rotary systems generally comprise either a rotary valve typically having a plurality of blades radially mounted, or a rotating cylinder with chambers.
  • US 5,738,249 discloses a rotor accommodated in a casing having a circumferential surface sliding on the internal surface of the casing in airtight condition; the casing is provided with a powder feed part positioned above the rotor and is provided with a powder drop part positioned under the rotor. At least one quantity-measuring recessed part is formed in the slide surface of the rotor. In accordance with the rotation of the rotor, the quantity-measuring recessed part comes to communicate with the powder feed part, so that powder is fed from the powder feed part into the quantity-measuring recessed part.
  • the drop holes 29 may be combined to open into a single Y-shaped powder drop part (30), or alternatively, a plurality of powder drop parts (30) may be provided and arranged in mutually twisted relationship so as to be connected to a single feed pipe (19) (not shown).
  • the rotor chambers are mutually aligned, thereby dispensing powder synchronously. Since the mutually twisted powder drop parts merely convey the powder from the drop holes to a single feed pipe, there is no change in the synchronicity of flow from the rotor, i.e., the flow is interrupted in US 5,738,249.
  • the present invention provides means to effectively reduce unstable operations.
  • the present invention provides means to solve both problems, while maintaining accurate dosing. It is an object of the present invention to provide for a system for dispensing a particulated material wherein an essentially continuous and stable flow of particulated material is ensured.
  • the present invention relates to a device (200) for dispensing a particulated material comprising:
  • each rotary valve 100, 100'
  • the rotors (20, 20') of the device (200) are configured such that the combined flow of particulated material is essentially continuous.
  • the use of fewer, larger chambers allows effective capture and discharge of large particulated material.
  • the rate of rotation can be reduced while not affecting flow of particulated material, thereby reducing wear.
  • the continuous and preferably constant flow of particulated material maintains stable reaction conditions for a variety of downstream applications, in particular, for reactions where the particulated material is a catalyst.
  • a first rotor (20) of said at least two rotors (20, 20') is preferably aligned around its central ( ⁇ - ⁇ ') axis with respect to a second rotor (20') of the at least two rotors such that the chambers (22, 22a, 22b, 22b) of the first rotor (20) are aligned with the circumferential spaces (23') between the chambers (22', 22'a, 22'b) of the second rotor (20') of the pair.
  • the device (200) as described above may have any number of rotary valves (100, 100'), wherein the rotor (20, 20') of each valve (100, 100') is provided with any number of chambers (22, 22') evenly or unevenly distributed around the rotor circumference.
  • the device (200) as described above may have n number of rotary valves (100, 100'), wherein the rotor (20, 20') of each valve (100, 100') is provided with the same number of chambers (22, 22') (e.g., 1 , 2, 3, 4, 5, 6, 7, 8, or more) evenly distributed around the rotor circumference, whereby each rotor is revolutely offset from an adjacent rotor by an angle of (360/number of chambers )/n.
  • the rotor (20, 20') of each valve (100, 100') is provided with the same number of chambers (22, 22') (e.g., 1 , 2, 3, 4, 5, 6, 7, 8, or more) evenly distributed around the rotor circumference, whereby each rotor is revolutely offset from an adjacent rotor by an angle of (360/number of chambers )/n.
  • the device (200) as described above may have two rotary valves (100, 100'), wherein the rotor (20, 20') of each valve (100, 100') is provided with the same number of chambers (22, 22') (e.g., 1 , 2, 3, 4, 5, 6, 7, 8, or more) evenly distributed around the rotor circumference, whereby the rotors are revolutely offset by an angle of (360/number of chambers )/2.
  • the rotor (20, 20') of each valve (100, 100') is provided with the same number of chambers (22, 22') (e.g., 1 , 2, 3, 4, 5, 6, 7, 8, or more) evenly distributed around the rotor circumference, whereby the rotors are revolutely offset by an angle of (360/number of chambers )/2.
  • Each of the at least two rotors (20, 20') of the device (200) described above preferably has an identical arrangement of chambers.
  • the device (200) as described above preferably has two rotary valves (100, 100'), wherein the rotor (20, 20') of each valve (100, 100') is provided with 4 chambers (22, 22') evenly distributed around the rotor circumference.
  • the rotors (20, 20') of the device (200) described above are preferably in fixed revolute offset by 45 deg around their respective central axes ( ⁇ - ⁇ ').
  • Each inlet (12, 12') of the device (200) described above is preferably configured for attachment to an outlet (54, 54') of a hold tank (50).
  • the inlet (12, 12') and outlet (14, 14') of the device (200) described above are preferably diametrically opposed in relation to the (rotational) centre of the rotor (20, 20') and arranged on an axis vertical and perpendicular to the central axis ( ⁇ - ⁇ ') of the rotor, so that the filling and emptying of the chamber is provided by the force of gravity exerted on the particulated material.
  • the central axes ( ⁇ - ⁇ ') of the rotors (20, 20') of the device (200) described above are preferably in co-axial alignment.
  • the rotors (20, 20') of the device (200) described above are preferably at least partly formed from a metal or metal alloy.
  • a rotor (20, 20') of the device (200) described above preferably comprises, at least in part, a cylindrical, rounded or truncated-conical region onto which the chambers (22, 22') are disposed.
  • the device (200) as described above preferably further comprises a pair of sealing rings (28, 28a, 28b) disposed around the circumference of each rotor (20, 20'), flanking the circumferential region on which orifices to the chambers (22, 22a, 22b, 22c) are provided.
  • the sealing rings (28, 28a, 28b) of the rotors of the device (200) described above are preferably formed from any of polyamide, polyacetal, polyester, high density polyethylene, polytetrafluoroethylene or aromatic polyketones.
  • the chambers (22, 22') of each rotor (20, 20') of the device (200) described above are preferably at least partly spherical or at least partly ovoid.
  • the present invention also relates to a method for dispensing a particulated material comprising the steps:
  • the device of the method described above is preferably as defined above.
  • FIG. 1 is a part cross-section along a longitudinal, vertical plane of a device described herein, depicting the rotors in perspective view whereby the rotors are at least partly conical.
  • FIG. 2 is a part cross-section along a longitudinal, vertical plane of a device described herein, depicting the rotors in perspective view whereby the rotors are conical.
  • FIG. 3 is a part cross-section along a longitudinal, vertical plane of a device described herein, depicting the rotors in perspective view whereby the rotors are partly conical and the base of each cone is extended cylindrically outwards.
  • FIG. 4 is a part cross-section along a longitudinal, vertical plane of a device described herein, depicting the rotors in perspective view whereby the rotors are cylindrical.
  • FIG. 5 shows the device of FIG. 2 connected to a hold tank having two outlets.
  • FIG. 5A shows the device of FIG. 2 connected to a hold tank having a single outlet split into two using a splitter line.
  • FIG. 6 depicts a perspective view of a cylindrical rotor described herein, removed from the stator housing.
  • FIG. 7 depicts a perspective view of two cylindrical rotors of the invention joined co-axially.
  • FIG. 8 shows a notation for depicting the revolute offset between two rotors.
  • the rotor closest to the line of sight in FIG. 6 is depicted with a smaller profile
  • the rotor further from the line of sight and behind the first rotor is depicted with a larger profile.
  • the angle of offset, beta is shown as the rotation between the smaller and larger profiles.
  • FIG. 9 is view of a rotor along the central axis ( ⁇ - ⁇ ') axis, with circumferential surface arcs delta and gamma indicated.
  • FIG. 10 depicts a perspective view of a conical rotor, and shows the slope angle, epsilon.
  • the present invention provides a device for continuously dispensing a particulated material, which device has two or more rotary metering valves, each valve provided with a rotor having a plurality of discrete circumferentially arranged chambers - dosing chambers
  • the synchronous revolution of the rotors, the arrangement of chambers, and the alignment of rotors with respect to each other dispenses the particulated material asynchronously with respect to each rotor, and the combined flow over a revolution is essentially continuous.
  • the use of fewer, larger chambers allows effective capture and discharge of particulated material.
  • the rate of rotation can be reduced while not affecting flow of particulated material, thereby reducing wear.
  • the continuous flow of particulated material maintains stable conditions for downstream processing.
  • a device 200 for dispensing a particulated material which device comprises:
  • rotary valves 100, 100' each having a stator 10, 10' provided with an inlet 12, 12' and outlet 14, 14' for the particulated material, and a rotor 20, 20' seated in the stator 10, 10', sealing the inlet 12, 12' from the outlet 14, 14', each rotor disposed with at least one chamber 22, 22' for receiving particulated material through the inlet 12, 12' and dispensing it through the outlet 14, 14' as the rotor 20, 20' turns around its central axis A- A' or axis of rotation, and whereby the rotors 20, 20' are configured to rotate synchronously.
  • each rotor 20, 20' are configured to dispense particulated material asynchronously.
  • at least two rotors 20, 20' may be offset around their respective central axes A-A' such that the respective chambers 22, 22' dispense particulated material asynchronously They are further configured to provide a combined flow of particulated material from the rotors 20, 20' that is essentially continuous.
  • the stator outlets 14, 14' discharge into the reactor (not shown).
  • FIG. 1 there are provided two valves 100, 100', and the rotors 20, 20' are joined by a connecting shaft 30.
  • the rotors 20, 20' have, at least in part, a truncated conical region; the smaller (truncated) conical ends point towards each other.
  • the longitudinal outer ends of the device 200 are shown in part; it would be understood that the rotors 20, 20' may optionally extend longitudinally outwards, and may be enclosed in the respective stators 10, 10'.
  • the rotors 20, 20' in FIG. 1 have a truncated conical shape; it is appreciated that other suitable shapes may be employed that have a circular transverse profile such as cylindrical, oval, spherical.
  • FIG.2 shows a two valve 100, 100' arrangement of FIG. 1 , where the rotors 20, 20' have a truncated conical shape, and are enclosed in the respective stators 10, 10'.
  • FIG.3 shows a two valve 100, 100' arrangement of FIG. 1 , where the rotors 20, 20' extend cylindrically longitudinally outwards from the base of the respective truncated conical regions, and are enclosed in the respective stators 10, 10'.
  • FIG.4 is similar to the two valves 100, 100' arrangement of FIG. 2, except the rotors 20, 20' have a cylindrical shape.
  • the particulated material refers to a substance that is powered, granulated, flaked, ground or other form of particulated solid that has flowability.
  • the particulated material may be provided in a dry state or in a slurry, for example, diluted in an oil.
  • the particulated material may be any required in a steady and controllable supply by a downstream (subsequent) processing application.
  • the particulated material may be a catalyst.
  • the present invention is particularly useful for the delivery of catalyst to a polymerization reactor for gas or liquid phase polymerization, however, it is not necessarily limited thereto. Using the device makes it possible to dispense reliably and continuously determined quantities of particulated material.
  • Each inlet of the stator may be fluidicly connected to an outlet of a gravity-fed hold tank, in which the particulated material is stored prior to dispensing.
  • the hold tank has an opening at the top for filling, and one or more tank outlets towards or at the base where particulated material exits.
  • An outlet of the hold tank may connect to a single stator inlet.
  • an outlet of the hold tank may connect to more than one (e.g.
  • stator inlets this may be achieved using a splitter line, having one or more splitter inlets for connection to one or more outlets of the holding tank(s), and two or more splitter outlets for connection to two or more stator inlets.
  • the splitter line outlets are in fluid connection with the splitter line inlets.
  • the number of splitter line inlets is less than the number of splitter line outlets. In this way, a limited number of tank outlets can serve a greater number of stator inlets, more specifically, a single tank outlet can serve multiple stator inlets.
  • the splitter line comprises a bifurcated tube having one splitter line inlet and two splitter line outlets.
  • the hold tank is adapted to provide flowability of particulated material.
  • the base of the tank may have sloping walls to funnel particulated material toward each outlet.
  • the base of the tank may be provided with one or more gas ports for dispensing pressurized gas pulses into the tank either to increase flowability or to break any agglomerates.
  • the gas used may be any inert gas such as nitrogen.
  • a single hold tank 50 is operatively connected to the device 200 of the instant invention, as shown in FIG. 1.
  • a first tank outlet 54 is fluidicly connected to a first stator inlet 12, and a second tank outlet 54' is fluidicly connected to a second stator inlet 12'.
  • the tank as illustrated has an open filling end 52, however, it may equally be covered and/or sealed.
  • the lower walls 56, 56' slope at an angle, alpha, towards each tank outlet 54, 54' to facilitate discharge.
  • the angle, alpha, between the straight wall of the upper part of the tank, and the sloped wall of the lower part of the tank is preferable less than or equal to 5 deg, 10 deg, 15 deg, 20 deg, 25 deg, 30 deg, or a value in the range between any two of the aforementioned values.
  • a gas inlet port 58, 58' located proximal to each tank outlet 54, 54' supplies nitrogen pulses for agitation.
  • a piston valve 62, 62' allows rapid emptying of the holding tank through; this is utilized, for example, when a changeover of particulated material is planned through a set of exit ports 60, 60'.
  • Valves 64, 64' control the passage of particulated material towards the outlet 54, 54'; preferably they are bistable valves i.e. they are either open or closed. Such bistable configuration allows feeding system to be isolated from the holding tank, in case of maintenance for instance.
  • the rotors 20, 20' of the device are joined by a connecting shaft 30, and a drive shaft 40 is connected to one rotor 20'.
  • the drive shaft is connected to a gear box 42, which in turn is driven by a motor 44.
  • the rotors 20, 20' have a truncated conical shape; it is appreciated that other suitable shapes may be employed that have a circular transverse profile.
  • FIG. 5A is similar to FIG. 5 except the hold tank 50 and device 200 are connected using a splitter line 70.
  • the hold tank 50 is provided with one outlet 54 fluidically connected to a splitter line 70 having one inlet 72 that splits into multiple (i.e. two) outlets for fluidic connection to the stator inlets 12, 12'. More specifically, the outlet 54 of the hold tank 50 is connected to a splitter line inlet 72, and each of the stator inlets 12, 12' is connected to a splitter line outlet 74, 74'.
  • the splitter line comprises a bifurcated tube. In this way, a single outlet serves multiple stator inlets.
  • Each stator is a stationary housing for a rotor, providing a seat in which the rotor is mounted and revolves.
  • the stator comprises a stator inlet, configured for fluid connection with an outlet of the holding tank.
  • the stator also comprises a stator outlet for discharging the particulated material.
  • the stator inlets and outlets are preferably circular ports. They may be equal in diameter.
  • the stator inlet and outlet for the particulated material are preferably located at the top and the bottom respectively of the stator.
  • stators are diametrically opposed in relation to the centre of the rotor and arranged on an axis vertical and perpendicular to the axis of rotation of the rotor, so that the filling and emptying of the chamber is provided by the force of gravity exerted on the free-flowing particulated material.
  • the inlet and outlets of the stator may be essentially rectangular or circular, and of equal size.
  • the stator may be provided with one or a plurality of gas outlet ports, directed in the vicinity of the outlet, to flush discharged particulated material from the chamber.
  • the ports may dispense inert gas (e.g. nitrogen) as short pressured pulses.
  • stators e.g. 2, 3, 4, 5 or more
  • the preferred number of stators being two.
  • Stators may be provided separately or as a single housing, depending on the configuration of the rotors. When the rotors are connected by a long shaft, it may necessitate that stators are discrete, separate elements. Alternatively, when the rotors are manufactured from a single cylindrical member, the stators may be joined to form a single, continuous housing.
  • two stators 10, 10' are joined side-by-side along the central axis ( ⁇ - ⁇ ') to form a single continuous housing that accommodates two rotors 20, 20' co-axially joined.
  • Each stator 10, 10' is provided with a stator inlet 12, 12' and a stator outlet 14, 14' for the particulated material, and has a seating for a rotor 20, 20'.
  • Each stator outlet 14, 14' is disposed with a gas inlet port 16, 16' connected to a feeding line 18, 18', to flush discharged particulated material from the chamber 22, 22'.
  • Each rotor is seated in a corresponding stator. It seals the stator inlet from the stator outlet.
  • Each rotor has a central axis ( ⁇ - ⁇ '), which is co-axial with the axis of rotation of the rotor. Preferably, the central axis is horizontal.
  • seals it is meant that rotor acts as a barrier preventing the free flow of particulated material from the stator inlet to the stator outlet.
  • the rotor is preferably formed at least partly, preferably entirely, from a metal or metal alloy, for example, stainless steel, which provides durability and robustness.
  • the two or more rotors are in co-axial alignment.
  • they are rigidly connected, for example, by way of a shaft, by adjacent rigid connection, or by virtue of manufacture from a single cylindrical element.
  • the rigid connection allows synchronous rotation of the rotors, i.e. they rotate in unison, at the same speed.
  • the rotors are driven by a source of torque, such an electric or turbine motor, directly or via a gearbox.
  • a rotor may comprise, at least in part, a cylindrical, rounded (truncated-spherical) or truncated- conical region onto which the chambers are disposed.
  • a truncated conical region refers to a cone-shape in which the point of the cone is truncated.
  • the truncated part is preferably planar and parallel to the base of the cone.
  • all the rotors have the same shape and dimensions.
  • each rotor may be oriented in the same direction i.e. the smaller end of the cone pointing the same direction.
  • two or more rotors may be oriented in different directions i.e. the smaller end of the cone pointing away or towards each other.
  • the small ends of the cones point towards each other.
  • two rotors 20, 20' each comprise a truncated conical region.
  • two rotors 20, 20' each comprise a truncated conical region and a cylindrical region adjoining the base of the cone.
  • two rotors 20, 20' each have a truncated conical shape.
  • the smaller ends of the rotors 20, 20' point towards each other and are joined co-axially.
  • two rotors 20, 20' each have a cylindrical shape and are joined co- axially.
  • a cylindrical rotor 20 is shown devoid of the stator, and comprises four chambers 20, three of which 20a, 20b, 20c are in view.
  • Each rotor is provided with at least one chamber for receiving and dispensing the particulated material as the rotor turns around its central axis.
  • a chamber is a cavity of defined volume set into the body of the rotor, with an orifice on the cylindrical rotor surface.
  • the rotor comprises more than one chamber, they are preferably distributed evenly around the circumference of the rotor, and are preferably arranged in a common plane transverse to the central axis of the rotor.
  • the stator inlet and outlet are also aligned in the same plane.
  • the chambers are preferably circumferentially distanced from each other in a rotor of a rotary valve, in a manner such that at any instant during the rotation of the rotor, the stator inlet and the stator outlet of the rotary valve can each be placed only in communication with a single chamber. In this case, it is preferable that at the moment when one chamber is placed in communication with the stator inlet, another chamber of the same rotor is in communication with the stator outlet.
  • a chamber may have an essentially circular or rectangular orifice at the surface of the rotor, which leads to the chamber void.
  • the size of the orifice is less than or preferably equal to the size of the stator outlet.
  • the volume of a chamber depends upon the application, and the determination of chamber volume, rotor speed etc. is well within the capabilities of the skilled person.
  • the shape of the chamber may be conical, cylindrical, spherical, ovoidal, truncated spherical (e.g. semi-spherical), truncated ovoid (e.g. semi-ovoidal) or truncated cone. Preferably, said shape is semi-spherical or semi-ovoidal.
  • the sealing effect of the rotor 20, 20' may be enhanced when the rotor comprises a truncated conical region (e.g. FIGs. 1 to 3).
  • the stator 10, 10' seat has a reciprocating conical shape, therefore, linear force applied to the longitudinal end of the rotor 20, 20' in a direction from the base to the small end of the truncated conical region will decrease a working gap between the rotor 20, 20' and stator 10, 10'.
  • the rotor 20, 20' may be seated optimally in stator 10, 10', continually and over the lifetime of the rotor 20, 20'.
  • the force may be applied using a spring.
  • Sealing effect of the rotor may be enhanced by the provision of one or more sealing rings.
  • a pair of sealing rings may be disposed around the circumference of each rotor, flanking the circumferential region where the chamber orifices are provided. Alternatively, or in addition, a sealing ring may be provided around the orifice of each chamber.
  • a sealing ring can be made from any material having the requisite durability and friction reducing qualities. Suitable material include polyamide (ERTALON), polyacetal (ERTACEL), polyester (ERTALYTE), polyethylene high density (CESTILITE), polytetrafluoroethylene (FLUOROSINT) and aromatic polyketones (KETRON).
  • ERTALON polyamide
  • ERTACEL polyacetal
  • ERTALYTE polyester
  • CESTILITE polyethylene high density
  • FLUOROSINT polytetrafluoroethylene
  • KETRON aromatic polyketones
  • pair 28a, 28b of sealing rings 28 disposed around the circumference of the rotor 20, flanking the circumferential region where the chambers 22, 22a, 22b, 22c are provided.
  • the seal ring is preferably applied when the rotor has a cylindrical shape.
  • the rotors are configured to rotate synchronously i.e. in unison, at the same rate. At least two rotors are aligned with respect to each other, such that the respective chambers dispense particulated material asynchronously (at different times), and the flow of particulated material from the combination of rotors is essentially continuously.
  • asynchronously it is mean that one or more of the start, duration and end of the dispensing period is different between the two rotors.
  • the rotors dispense alternately (two rotors), tandemly (more than two rotors) or in any pattern (more than two rotors), the net effect being an essentially continuous flow, spatially separated along the central axes of the two or more rotors.
  • the chambers of one rotor may be in fixed revolute offset with respect to each other, so as to dispense in the periods where the chambers of the other rotor have stopped dispensing.
  • n number of rotary valves 100, 100' e.g.
  • each valve (100, 100') is provided with the same number of chambers (22, 22') (e.g., 1 , 2, 3, 4, 5, 6, 7, 8, or more) evenly distributed around the rotor circumference, whereby each rotor is revolutely offset from an adjacent rotor by an angle of (360/number of chambers)/n.
  • two rotary valves 100, 100' are provided, wherein the rotor 20, 20' of each valve 100, 100' has the same number of chambers 22, 22' (e.g., 1 , 2, 3, 4, 5, 6, 7, 8, or more) evenly distributed around the rotor circumference, whereby the rotors are revolutely offset by an angle of (360/number of chambers )/2.
  • the flow of particulated material may be essentially constant. Ideally there is essentially no change in the flow rate of particulated material.
  • the flow rate may be measured, for example, as mass / time units (e.g. grams per second).
  • the flow rate may be essentially constant.
  • An essentially constant flow or flow rate may provide some tolerance, for instance a maximum variation of ⁇ 5 %, ⁇ 10 %, ⁇ 15 %, ⁇ 20 %, ⁇ 25 % in the flow rate compared with a target value.
  • the rotors may each have an identical arrangement of chambers, and are in fixed offset by rotation around their central axes by a certain axial angle, beta.
  • FIG. 8 shows a notation for depicting the revolute offset, beta, between two rotors.
  • the rotor closest to the line of sight 46 in FIG. 7 is depicted with a smaller profile, the rotor farther from the line of site in FIG. 7 and behind the first rotor is depicted with a larger profile.
  • the sizes of the profiles do not reflect the rotor sizes; they show the order of rotors from the line of sight 46 ( ⁇ - ⁇ ') in FIG. 7 onwards.
  • the angle of offset, beta is shown as the rotation between the smaller and larger profiles.
  • beta is set such that, during the rotation cycle of the device, one stator outlet at a time fully opens into a chamber orifice.
  • beta is set such that, during the rotation cycle of the device, one stator outlet of a pair of stator outlets is open (into a chamber) while the other of the pair is closed (from a chamber).
  • beta is set such that the chamber orifices of one of a pair of rotors are aligned with the circumferential spaces between the chamber orifices of the other of the pair.
  • the chamber orifices on each rotor are arranged in such a way that the total circumferential length of the orifices of each rotor is cumulatively essentially equal to the circumference of one rotor when the rotors have the same diameter, or to the average circumference of the rotors when at least two rotors have different diameters.
  • the chamber orifices on the rotors may be arranged such that they have some overlap or some gaps between, but it is preferred that they have some overlap and most preferred that they touch in a single point. Preferably, and as shown in FIGs.
  • each rotor 20, 20' provided with 4 chamber (22a, 22b, 22c, 22'a, 22'b) each opening into an orifice, said orifices are evenly distributed around the circumference, and the rotors (20, 20'), held in co-axial alignment, are offset by angle beta around their respective central axes ( ⁇ ').
  • beta is 45 deg.
  • beta is 90 deg
  • beta is 60 deg
  • beta is 60 deg
  • beta when the number of chambers per rotor is four
  • beta is 45 deg
  • beta when the number of chambers is five, beta is 36 deg etc.
  • beta would be (360 / number of chambers)/n.
  • beta would be (360 / number of chambers )/2.
  • Beta may be set such that the chamber (e.g. 22b) orifices of one 20 of a pair 20, 20' of rotors aligns with the circumferential spaces (e.g. 23') between the chamber orifices of the other rotor 20' of the pair, as show in FIG. 8.
  • the arc (delta) of a circumferential space 23 on surface of a rotor 20 delimited by between two chamber 22a, 22b orifices is equal to or less than the arc (gamma) of the circumferential surface of said rotor 20 delimited by the circumferential edges of a chamber 22a orifice, as illustrated in FIG. 9.
  • the arcs of each of the chamber orifices and each of the intervening spaces may have the same value of delta and gamma, the rotors may be identical, the offset, beta, may be set such that the chamber orifices of one rotor align with the spaces between the chamber orifices of the other rotor.
  • the device has application where a continuous and controlled dispensing of particulated material is needed.
  • the invention is particularly suitable for delivery of a particulated catalyst to a polymerization reactor.
  • the term "catalyst" refers to a substance that causes a change in the rate of a polymerization reaction without itself being consumed in the reaction.
  • the invention is especially applicable to catalysts suitable for the polymerization.
  • the particulated catalyst is an olefin polymerization catalyst.
  • the catalyst may catalyze the polymerization of ethylene to polyethylene (i.e. a ethylene polymerization catalyst).
  • ethylene polymerization catalysts include metallocene catalysts, chromium and/or Ziegler-Natta catalysts.
  • the present invention is particularly suitable for supplying catalyst to a polymerization process for preparing polyolefin, and preferably polyethylene, and more preferably for preparing monomodal or bimodal polyethylene.
  • the feeding device of the present invention may be used for feeding catalyst slurry to a polymerization loop reactor.
  • Olefin polymerization loop reactors preferably ethylene polymerization loop reactors, suitable for use with the instance device, comprise a plurality of interconnected pipes, defining a reactor path.
  • the reactor comprises one or more lines for introduction of reactants.
  • catalyst, and optionally activation agent is supplied into the reactor by means of a device as described herein.
  • the feeding device of the present invention may, alternatively, be used for feeding particulated catalyst (granular, flaked or powdered) to a gas phase polymerization system.
  • the device is particularly useful for the introduction of a catalyst into an alpha-olefin polymerization reactor wherein the polymerization is performed under high pressure, and more especially into a gas-phase alpha-olefin polymerization reactor such as for example into a gas-phase fluidized-bed reactor or in a gas-phase stirred reactor.
  • said reactor is operated, for example under fluidized bed conditions.
  • the invention also provides a use of a device as described herein for continuous dispensing of a particulated material for a down stream (subsequent) application.
  • uses include addition of additives to a reactor, e.g. a polymerization reactor; addition of additives, such as antioxidants, colorants, acid scavengers and the like to a polymer powder before granulation in an extruder.
  • a device as described herein for continuous dispensing of a catalyst into a polymerization reactor.
  • it is useful for continuous feeding of a catalyst into an olefin polymerization reactor.
  • polyethylene such as polyethylene (PE) or polypropylene (PP).
  • PP polypropylene
  • the invention also provides a use of a device as described herein for dispensing a particulated material, wherein the flow of particulated material is essentially constant.
  • the device of the present invention is suitable for use with any, if not most kinds of catalyst i.e. dry particulated catalyst, or slurry formed from particulated catalyst in the presence of a diluent as mentioned elsewhere herein.
  • catalyst i.e. dry particulated catalyst, or slurry formed from particulated catalyst in the presence of a diluent as mentioned elsewhere herein.
  • the invention also provides a device 200 as defined herein, for continuously metering catalyst injection into a polymerization reactor.
  • the catalyst may be a particulated solid such as a powder, granules or flakes.
  • the catalyst may be a slurry.
  • the invention also provides a method for dispensing a particulated material comprising the steps:
  • a device 200 having at least two rotary valves 100, 100', each having a stator 10, 10' provided with an inlet 12, 12' and outlet 14, 14' for the particulated material, and a rotor 20, 20' seated in the stator 10, 10' sealing the inlet 12, 12' from the outlet 14, 14', each rotor disposed with at least one chamber 22, 22' for receiving and dispensing the particulated material as the rotor 20, 20' turns around its central axis A-A',
  • the method of the invention may utilize a device 200 as described herein.
  • a chamber of a rotor may have a volume depending on several factors, including the required dispensing rate, rotor speed, size and application. As a general guidance, the chamber of a rotor may have a volume ranging from about 1 to about 100 cm 3 , preferably from about 20 to about 70 cm 3 , more preferably from about 20 to about 100 cm 3 when the application is dispensing a catalyst for a polymerization reactor.
  • a chamber of a rotor may have a volume calculated according to Equation [1].
  • V C A the volume of each chamber, V C A, is calculated in Equation [2] when there are N chambers per rotor and there are 2 rotors:
  • the positioning of the chambers in one rotor is determined by ⁇ ⁇ ⁇ in Equation [4] o _ 2. ⁇
  • Equation [5] The positioning of the chambers in the other rotor is determined by ⁇ ⁇ ⁇ 2 in Equation [5] which provides a continuous or essentially continuous flow:
  • Equation [6] the minimum radius of the rotors, R Cy , that is adapted to fit all chambers is calculated approximately using Equation [6]:
  • Equation [7] In order to have alignment or overlap between chambers of one rotor with respect to the chambers of the other rotor to achieve continuous metering of catalyst, Equation [7] is respected:
  • a reactor throughput, Q, of 30 ton/h a catalyst with a productivity, P, of 8000 gPE/g catalyst, a catalyst bulk density, MVA, of 0.28 g/cm 3 , rotation speed, RPM, of 1 , two rotors, and 4 chambers per rotor, the resulting volume, V, required in one rotation of the device is 223.2 cm 3 , the volume of each chamber is 27.9 cm 3 , the radius, R C A, of each chamber is 2.4 cm, the minimum radius of the rotors, R Cy min, is 3.7 cm, and minimum radius of the rotors, Rc y m ax, is 6.1 cm.

Abstract

La présente invention concerne un dispositif (200) pour délivrer un matériau particulaire comprenant : au moins deux vannes rotatives (100, 100'), chacune ayant un stator (10, 10') pourvu d'une entrée (12, 12') et d'une sortie (14, 14') pour le matériau particulaire, et un rotor (20, 20') en place dans le stator (10, 10') scellant l'entrée (12, 12') de la sortie (14, 14'), chaque rotor étant disposé avec au moins une chambre (22, 22') pour recevoir et délivrer le matériau particulaire quand le rotor (20, 20') tourne autour de son axe central (A-A'); les rotors (20, 20') étant configurés pour tourner de manière synchrone; les chambres (22, 22') d'au moins deux rotors (20, 20') étant configurées pour délivrer le matériau particulaire de manière asynchrone, et les rotors (20, 20') du dispositif (200) étant configurés de manière à ce que le flux combiné du matériau particulaire soit pratiquement continu. L'invention concerne aussi un procédé pour délivrer un matériau particulaire.
PCT/EP2012/076067 2011-12-20 2012-12-19 Dispositif de dosage d'alimentation en continu WO2013092652A1 (fr)

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EA201490923A EA029241B1 (ru) 2011-12-20 2012-12-19 Дозирующее устройство с непрерывной подачей
CN201280063300.3A CN103998120B (zh) 2011-12-20 2012-12-19 连续进料计量装置
EP12813815.3A EP2794082B1 (fr) 2011-12-20 2012-12-19 Dispositif de mesure d'alimentation continue
KR1020147019481A KR101619053B1 (ko) 2011-12-20 2012-12-19 연속 공급물 계량장치

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WO2019046876A1 (fr) * 2017-09-07 2019-03-14 Ventrex Automotive Gmbh Vanne d'arrêt cryogénique

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CN106743674B (zh) * 2017-02-28 2022-12-23 中国空气动力研究与发展中心高速空气动力研究所 一种将固体粉末送入高速气流的装置

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EP0879638A1 (fr) * 1997-05-22 1998-11-25 Chevron Chemical Company LLC Système d'injection et procédé pour introduire des particules solides dans un récipient de traitement
WO2008145601A1 (fr) * 2007-06-01 2008-12-04 Basell Polyolefine Gmbh Procédé d'alimentation en catalyseur d'un réacteur de polymérisation

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US3139996A (en) * 1962-10-29 1964-07-07 Phillips Petroleum Co Rotary solids feeder
US5738249A (en) 1995-09-07 1998-04-14 Mitsui Petrochemical Industries, Ltd. Quantitative powder feeder capable of feeding powder by fixed amounts
EP0879638A1 (fr) * 1997-05-22 1998-11-25 Chevron Chemical Company LLC Système d'injection et procédé pour introduire des particules solides dans un récipient de traitement
WO2008145601A1 (fr) * 2007-06-01 2008-12-04 Basell Polyolefine Gmbh Procédé d'alimentation en catalyseur d'un réacteur de polymérisation

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WO2019046876A1 (fr) * 2017-09-07 2019-03-14 Ventrex Automotive Gmbh Vanne d'arrêt cryogénique

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CN103998120A (zh) 2014-08-20
EA201490923A1 (ru) 2015-01-30
EA029241B1 (ru) 2018-02-28
CN103998120B (zh) 2016-11-02
EP2794082A1 (fr) 2014-10-29
KR20140107444A (ko) 2014-09-04
KR101619053B1 (ko) 2016-05-10
EP2794082B1 (fr) 2018-01-31

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